ARM and PowerVR still reign - with considerable improvements.
The new hardware inside the new iPhone 3G S is two times faster than the old hardware, on average, or so Apple claims.
This improvement comes from the upgrade to an ARM Cortex A8 based core, dual issue capable but still in-order, which is also clocked around 50% higher, from 412MHz to 600MHz.
The graphics chip is still based on PowerVR IP but has been upgrade to the new SGX core, instead of the old MBX. The new SGX core is OpenGL ES 2.0 compatible and exceeds DX 10.1, shader Model 4.1 capabilities - the old model only had fixed function hardware, like GeForce 1/2 cores.
The old hardware was quoted by developers as similar to a Dreamcast, these upgrades bring the iPhone much closer to what a PSP can do, exceeding it in graphics capabilities as far as features go. The PSP is still faster spitting out polygons, with a theoretical maximum of 33 million per second, versus 7 million on the SGX.
iPhone 3G S hardware exposed @ Anandtech
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